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13 - Wrest-plank back-cap/ pinblock fill piece
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In a piano, the pinblock fill piece (also known as a pinblock filler or tuning pinblock filler) is a small, wooden wedge that is used to fill the gap between the tuning pins and the pinblock. The pinblock (also known as the wrestplank or tuning pinblock) is a wooden structure located at the back of the piano that supports the tuning pins. The tuning pins are long, thin metal rods that hold the strings in place and allow the pitch of the strings to be adjusted. Each string in a piano is attached at one end to the plate (also known as the harp or frame) and at the other end to a tuning pin. The tuning pins are inserted into the pinblock and are tightened or loosened to adjust the tension of the strings. The pinblock fill piece is used to ensure that the tuning pins are held securely in place and to prevent them from slipping or vibrating loose. It is an important part of the piano's structure and helps to keep the instrument in tune.
